Method of watermarking a video signal, a system and a data medium for implementing said method, a method of extracting the watermarking from a video signal, and system for implementing said method

a video signal and watermarking technology, applied in the field of watermarking a video signal, can solve the problems of not being robust and the solution running the risk of making the watermarking more visible in the video signal, and achieve the effect of improving the watermarking performan

Inactive Publication Date: 2004-09-09
FRANCE TELECOM SA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0008] The invention aims to remedy those drawbacks by providing a robust method of watermarking a video signal that imp

Problems solved by technology

Unfortunately, that solution is not very robust, since the slightest attack can transform an even ordinate into an odd ordinate and vice-versa.
Moreover, by always modifying the same

Method used

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  • Method of watermarking a video signal, a system and a data medium for implementing said method, a method of extracting the watermarking from a video signal, and system for implementing said method
  • Method of watermarking a video signal, a system and a data medium for implementing said method, a method of extracting the watermarking from a video signal, and system for implementing said method
  • Method of watermarking a video signal, a system and a data medium for implementing said method, a method of extracting the watermarking from a video signal, and system for implementing said method

Examples

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Embodiment Construction

[0046] The watermarking method shown in FIG. 1 is implemented by conventional data processing means, for example a microcomputer that comprises a central processor unit (CPU) associated with random access memory (RAM) and read-only memory (ROM).

[0047] The watermarking method includes a first step 10 of motion estimation.

[0048] During this step, a source video signal S is fed to the input of the microcomputer and a matrix 12 of motion vectors is associated with any image of the video signal S in the conventional way. This matrix of motion vectors is used to generate a prediction of the image concerned, for example starting with the preceding image of the video signal, by moving blocks of pixels thereof as a function of the calculated motion vectors.

[0049] The motion vectors are calculated by applying a block matching method, for example. For each block of pixels of the image concerned, this method consists in evaluating the best motion vector for reconstructing the current block from...

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Abstract

The method comprises the following steps: applying a watermarking function to motion vectors calculated by estimation of movement between images of a video signal; and generating the watermarked video signal by compensating movement with the aid of the watermarked motion vectors. The watermarking function is applied by: marking the coordinates of the selected motion vector in a space, certain portions of this space constituting a first zone and the other portions of this space constituting a second zone complementary to the first; assigning a binary value to each of the two zones; and where necessary, modifying the coordinates of the selected motion vector so that it is in the zone whose binary value corresponds to a bit of a marking key associated with the selected motion vector.

Description

[0001] The present invention relates to a method of watermarking a video signal, a corresponding system, and a computer readable data medium for storing a signal watermarked by this method. It also relates to a method of extracting the watermarking from a video signal and a system for implementing this method.[0002] To be more precise, the invention relates to a method of watermarking a video signal by applying a watermarking function to motion vectors calculated by motion estimation between images of the video signal, the method being of the type comprising the following steps:[0003] applying the watermarking function to at least some of the calculated motion vectors; and[0004] generating the watermarked video signal by motion compensation with the aid of the watermarked motion vectors,[0005] the watermarking function being applied with the aid of a binary marking key, each bit of which is associated with at least one selected motion vector.[0006] A method of the above kind is desc...

Claims

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Application Information

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IPC IPC(8): G06T1/00H04N7/26
CPCG06T1/0085H04N19/467G06T2201/0053
Inventor BODO, YANNLAURENT, NATHALIE
Owner FRANCE TELECOM SA
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